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Open AccessFeature PaperArticle

Design of Wear-Resistant Diecast AlSi9Cu3(Fe) Alloys for High-Temperature Components

1
Department of Management and Engineering, University of Padova, Stradella San Nicola 3, I-36100 Vicenza, Italy
2
Veneto Nanotech Spa, Via delle Industrie, 5 I-30175 Venezia Marghera, Italy
*
Author to whom correspondence should be addressed.
Metals 2020, 10(1), 55; https://doi.org/10.3390/met10010055
Received: 24 November 2019 / Revised: 22 December 2019 / Accepted: 24 December 2019 / Published: 28 December 2019
(This article belongs to the Special Issue Dedicating to Professor John Campbell's 80th Birthday)
Type AlSi9Cu3(Fe) alloy has been modified by alloying with iron, manganese, and chromium elements to develop wear-resistant diecast hypoeutectic Al–Si–Cu alloys that can be applied for high-temperature applications. Several alloys have been produced by varying iron, manganese, and chromium levels (0.80, 1.00, 1.20 wt.% for Fe; 0.25, 0.40, 0.55 wt.% for Mn, and 0.06, 0.10 wt.% for Cr). Brinell hardness measurements and pin-on-disk wear tests have been conducted from room temperature up to 200 °C. The microstructural changes that occurred with the different alloying levels have been quantitatively examined by metallographic and image analysis techniques. The results showed how the increasing content of the Fe, Mn, and Cr promoted the precipitation of both primary and secondary Fe-enriched particles, mainly with polyhedral, blocky, and star-like morphologies. These compounds showed high hardness that is not affected by chemical composition and morphology variation. At high temperatures, the diecast alloys always showed lower average hardness and wear resistance, especially at 200 °C; however, a greater amount of Fe-rich particles can compensate the alloy softening. View Full-Text
Keywords: aluminum alloys; high-pressure die casting; sludge; Fe-rich compounds; high temperature; wearing; hardness aluminum alloys; high-pressure die casting; sludge; Fe-rich compounds; high temperature; wearing; hardness
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Timelli, G.; Fabrizi, A.; Vezzù, S.; De Mori, A. Design of Wear-Resistant Diecast AlSi9Cu3(Fe) Alloys for High-Temperature Components. Metals 2020, 10, 55.

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